September 21,1918 Scientific America
The second photograph is a front view of the Letort biplane; which, aside from its fantastic stream-line engine nacelles, has several novel features. In the first place, it is a three-seater twin-engined machine intended for photographic and reconnaissance missions. Its planes are back-staggered; that is to say, the upper plane is farther back than the lower one, and the struts rise backward instead of forward or perpendicularly.
A circular form of radiator is employed on this No. 7 model of the Letort type, between the cylinder casings of the engine nacelle. The forward cockpit is occupied by an observer, who operates the Lewis gun when necessary, as well as a camera which is aimed through a well in the forward end of the nacelle. Behind the observer is the pilot, and still farther behind comes the rear gunner.